linux-ext4 - Re: [RFC PATCH 1/1] add a jbd option to force an unclean journal state

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Message-ID: <47CE0976.70304@redhat.com>
Date:	Tue, 04 Mar 2008 20:46:14 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Jan Kara <jack@...e.cz>, jbacik@...hat.com,
	linux-ext4@...r.kernel.org
Subject: Re: [RFC PATCH 1/1] add a jbd option to force an unclean journal
 state

Andrew Morton wrote:

> So it's 100% scriptable and can be left running overnight, etc.  It found
> quite a few problems with ext3/jbd recovery which I doubt could be found by
> other means.  This was 6-7 years ago and I'd expect that new recovery bugs
> have crept in since then which it can expose.
> 
> I think we should implement this in a formal, mergeable fashion, as there
> are numerous filesystems which could and should use this sort of testing
> infrastructure.


FWIW, xfs has something vaguely similar, the XFS_IOC_GOINGDOWN ioctl,
which invokes xfs_fs_goingdown, which takes a few flags:

/*
 * Flags for going down operation
 */
#define XFS_FSOP_GOING_FLAGS_DEFAULT            0x0     /* going down */
#define XFS_FSOP_GOING_FLAGS_LOGFLUSH           0x1     /* flush log but
not data */
#define XFS_FSOP_GOING_FLAGS_NOLOGFLUSH         0x2     /* don't flush
log nor data */


but ultimately calls xfs_force_shutdown, which is sort of rougly similar
to ext3_abort....

The xfs qa tests make use of this ioctl.

-Eric

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